First post, so I hope someone can help me with this weirdness
I have a number files with some rows of information I want to extract, at the same time I want to add to a string some details from the file. I have found two different ways of looping over rows in a file, but one method doesn't let me concatenarte strings and I don't know why....
The first method sets the IFS environmental variable. I don't really favour this method, but it works..
Code:
#!/bin/bash -
OLDIFS=$IFS
IFS='
'
STE="cat"
for FILE in $( ls *-df | cut -f 4 -d / ); do
N=0
for LINE in $( cat $FILE ); do
N=$((N+1))
STE="$STE""dog"
done
done
echo "$STE" && exit
and produces:
catdogdogdogdogdogdogdogdogdogdogdogdogdogdogdogdo gdogdogdogdogdogdogdogdogdogdogdogdog
Method 2 uses "read" but prevents the concatenation of the string:
Code:
#!/bin/bash -
STE="cat"
for FILE in $( ls *-df | cut -f 4 -d / ); do
N=0
cat "$FILE" | while read LINE ; do
N=$((N+1))
STE="$STE""dog"
done
done
echo "$STE" && exit
and produces:
cat
Why is there a difference in the two methods? I would rather not be changing environmental variables and a simple loop is my preferred choice.
Thanks for your help, as this has been driving me crazy...
Stephen
my input file contains thousands of lines like below
234A dept of education
9788 dept of commerce
8677 dept of engineering
How do i add a delimeter ':' after FIRST 4 CHARACTERS in a line
234A:dept of education
9788:dept of commerce
8677:dept of engineering (7 Replies)
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5 6
7 8
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I tried
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Discussion started by: PreetArul
7 Replies
LEARN ABOUT REDHAT
gzexe
GZEXE(1) General Commands Manual GZEXE(1)NAME
gzexe - compress executable files in place
SYNOPSIS
gzexe [ name ... ]
DESCRIPTION
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a
penalty in performance). For example if you execute ``gzexe /bin/cat'' it will create the following two files:
-r-xr-xr-x 1 root bin 9644 Feb 11 11:16 /bin/cat
-r-xr-xr-x 1 bin bin 24576 Nov 23 13:21 /bin/cat~
/bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file. You can remove /bin/cat~ once you are sure that
/bin/cat works properly.
This utility is most useful on systems with very small disks.
OPTIONS -d Decompress the given executables instead of compressing them.
SEE ALSO gzip(1), znew(1), zmore(1), zcmp(1), zforce(1)CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the
PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep).
BUGS
gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases,
using chmod or chown.
GZEXE(1)